Electric bell.



No. 855,729. PATENTED JUNE 4, 1907. M. PLATO. ELECTRIC BELL.

APPLICATION IILED 00m, 1904.

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PATENTED JUNE 4, 1907. M. PLATO. ELEGTRIGBBLL. APPLIUATI ON FILED 0OT.6.1904.

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UNITED STATES PATENT OFFICE.

MARCUS PLATO, OF LONDON, ENGLAND, ASSIGNOR OF ONE-I-IALF TO ARTHURWILLIAM MAOLEOD, OF LONDON, ENGLAND.

ELECTFHC BELL.

Specification of Letters Patent.

Patented June 4, 1907.

Application filed October 6, 1904. Serial No. 227,429.

To all 1071/0711 it may concern:

Be it known that I, MARCUS PLATO, a subject of the German Emperor,residing at 37 Walbrook, in the city of London, England, have inventednew and useful Improvements in Electric Bells, of which the following isa specification.

My invention relates to electric bells.

Large bells require heavy clappers or hammers to produce an adequatevolume of sound from them, and hitherto it has not been foundpracticable to operate such clappers or hammers by electricity without alarge expenditure of electric current or battery power.

The object of my invention is to provide means whereby the ordinarytrembling mechanism now used in small bells, can be utilized foroperating heavy clappers or hammers and with a minimum expenditure ofcurrent, and to this end my invention consists essentially in providingin connection with a hammer of suitable weight, a counterbalancingweight or spring.

In the accompanying drawing :Figure 1 is a sectional view of a bellhaving a counterbalanced hammer arranged in accordance with myinvention, the hammer being in a vertical position. Fig. 2 is asectional view illustrating a modification wherein a spring is used inlieu of a counter-weight. Fig. 3 is a view similar to Fig. 1 but showingan arrangement wherein the hammer is arranged horizontally.

In the arrangement of my invention shown in Fig. 1, the bell a haswithin it a box I) in which an ordinary electromagnet c is mounted, thesaid magnet having in conjunction with it an ordinary armature (Zprovided with a spring contact 6 operating in conjunction with a screwcontact f in a well known manner, to make and break the circuit of themagnet coils.

g is the hammer for striking the bell, the said hammer bein mounted upona pivot h and connected with the armature d by a link i and j is acounter-weight which is arranged to balance the hammer g so that thelatter can be moved with a minimum of power.

Vv ith this arrangement it will be understood that when a tremblingmovement is imparted to the armature d a corresponding movement will betransmitted to the hammer g.

Instead of using a weight as described, I may substitute a spiral spring7c, as shown in Fig. 2. This spring is so arranged that its tension canbe adjusted by means of the screw-eye and nut Z. The use of a springinstead of a counter-weight permits of a more rapid action of thehammer, which is, in some cases, desirable, than when a weight is used.

The modification of my invention shown in Fig. 3 only differs from thatshown in Fig. 1,

in that the hammer g and counter-weight j 1 are arranged horizontallyinstead of vertically, the magnet 0 the armature d and link i beingcorres ondingly placed.

Although t e foregoing description refers to bells havin tremblingmovements, it is obvious that t e invention is equally applicable tosingle stroke bells.

In practice, the counter-weight is made adjustable upon its arm in orderto provide for an inaccurate counter-balancing of the hammer.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be per formed, I declarethat what I claim is In an electric bell, the combination with asupporting frame, of a trembling mechanism attached thereto andincluding among its members an electro-magnet and a movable armaturetherefor, a bell supported by said frame, a counter balanced hammerpivotally supported by said frame adjacent to the edge of the bell and alink connecting said hammer with the movable armature of the tremblingmechanism, substantially as described.

MARCUS PLATO.

Witnesses:

JOHN E. BOUSFIELD, O. G. REDFERN.

